First of all thank you so much for developing such a great program for free. We use it exclusively for worship projection in our church. I must confess that I have a little bit of a bad conscience for requesting a feature as the first means of communication with you developers, but anyways...
The active entry of the Service Manager is very hard to see when focus is not on the service manager (but in the LIVE area) with the default theme settings under Windows (under default KUbuntu it's no problem, there the selected but inactive elements are a lot more visible). Maybe showing the selected element in bold would be a solution, but I'm not sure whether this is a clean solution or only a workaround for a bad theme.